* {
	margin: 0;
	padding: 0;
}
 
ul {
	list-style: none;
}
body {
	height: 100vh;
	background: linear-gradient(45deg,#3498db,#9b59b6);
}

a {
	width: 60px;
	height: 60px;
	display: block; 
	font-weight: bold;
	color: white;
	border-radius: 50%;
	background: rgb(79,80,84);
	text-align: center;
	line-height: 60px;
	text-decoration: none;
	margin: 7px 7px;
	float: left; 
	
}
a:hover {
	color: #9b59b6;
}

#equals {
	height: 40px;
	line-height: 40px;
	width: 115px;
	display: block;
	border-radius: 20px;
	margin-top: 16px;
	margin-left: 20px;
	background: linear-gradient(-90deg,#3498db,#9b59b6); 
	position: relative;
	/* overflow: hidden; */
}
span {
	background-color: #FFFFFF;
	position: absolute;
	transform: translate(-50%,-50%);
	animation: move 1s linear infinite;
	border-radius: 50%;
	pointer-events: none;
}

@keyframes move{
	from{
		width: 0;
		height: 0;
		opacity: .7;
	}
	to{
		width: 500px;
		height: 500px;
		opacity: 0;
	}
}
.content {
	height: 410px;
	width: 250px;
	padding: 0 12px;
	background: rgb(35,34,39);
	border-radius: 15px;
	position: absolute; 
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	margin: auto auto;
	box-sizing: border-box;
	box-shadow: 0 0 20px black;
}
nav {
	position: absolute;
}
.circle li {
	width: 8px;
	height: 8px;
	border-radius: 50%;
	float: left;
	margin: 10px 2px;
}
.circle li:first-child {
	background: rgb(253,101,87);
}
.circle li:nth-child(2) {
	background: rgb(255,191,12);
}
.circle li:last-child {
	background: rgb(4,207,45);
}

.black {
	background: rgb(35,34,39); 
	font-size: 18px;
/* 	background: rgb(79,80,84); */
}
.black:hover  {
	box-sizing: border-box;
	border: #3498DB 1px solid;
	transition: .5s;
}

header {
	height: 115px; 
	position: relative;
}
header .line {
	position: absolute;
	bottom: 0;
	height: 1px;
	width: 100%;
	background: linear-gradient(90deg,#3498db,#9b59b6); 
}
.result {
	color: white;
	font-size: 34px; 
	position: absolute;
	right: 10px;
	bottom: 10px;
}
.computed {
	color: dimgrey; 
	position: absolute;
	right: 10px;
	bottom: 60px;
}

